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Product Description

CO2 Engine™ - ICB

Sensor module for bio applications

Figure 1. CO2Engine™ ICB (tube IN/OUT model)

General

• CO2 Engine™ ICB is targeted on bio applications with required measurement range

0 to up to 30%vol CO2. This document contains description of default appearance of

CO2 Engine™ ICB.

• CO2 Engine™ ICB is built on the CO2 Engine™ K33 platform. This platform is

designed to be a low power OEM module for built-in applications in a host apparatus

or/and as a stand alone CO2 transmitter/switch module, and hence should be

optimized for its tasks during a dialog between SenseAir and the OEM customer. This

document is to be considered as the starting point for such a dialog. One can find extra

ideas on connection and use of CO2 Engine™ K33 platform in platform

description.

• CO2 Engine™ ICB has the same dimension and attachment points as K30 platform

based sensors.

North American Distributorwww.AirTest.com604 517-3888


Connection to host system alternatives (See electrical specifications in the table “Terminal description” below)

Connection alternative A. CO2 Engine™ ICB is built in into the customer’s system by connection via JP5. I

2C

communication is used to read measured data from the sensor. Detailed description of I2C

communication with useful examples and troubleshooting can be found in “I2C comm guide

2_14.pdf”

Figure 2. CO2 Engine™ ICB Possible connection terminals for reading via I2C.

Note: Both Digital GND and Analog GND are connected to G0 internally.

I2C_SDA

I2C_SCL

G+

G0

DVCC = 3.3V

Digital GND

Analogue GND


Connection alternative B. CO2 Engine™ ICB is built in into the customer’s system by connection via JP1 or some part

of it. UART with Modbus protocol communication is used to read measured data from the

sensor. CO2 Engine™ ICB shares specification and Modbus register map with CO2 Engine

K30 sensor family. Specification can be found in “ModBus on CO2 Engine K30 rev1_07.pdf”

and “K30 ModBus map rev1_01.xls”

View from component side:

Figure 3a. CO2 Engine™ ICB Possible connection terminals for reading via UART.

Note: LEDs are optional.

View from OBA side:

Figure 3b. CO2 Engine™ ICB Possible connection terminals for reading via UART.

Din3

UART_TxD

UART_RxD

DVCC = 3.3V

G0

G+

G0

Din2

G0

Din0

Din1

G0

Din3

UART_TxD

UART_RxD

DVCC = 3.3V

G0

G+

G0

Din2

G0

Din0

Din1

G0


Connection alternative C. CO2 Engine™ ICB is built in into the customer’s system by connection via terminals. Signal

lines on these terminals are protected and long wires may be used for connection to the host

system.

5.08 mm pitch:

Figure 4a. CO2 Engine™ ICB Possible connection terminals for connection by long wires.

2 mm pitch:

Figure 4b. CO2 Engine™ ICB Possible connection terminals for connection by long wires.

Note: OUT1, open collector is configured to provide PWM signal,

see specification below.

OU

T2 (

An

alo

gu

e o

utp

ut)

O

UT

1 (

Op

en

co

llecto

r)

GN

0

G+

OU

T2 (

An

alo

gu

e o

utp

ut)

OU

T1 (

Op

en

co

llecto

r)

GN

0

G+


Connection alternative D.

Combination of alternatives B and C. It’s possible to use both UART and OUT1 at the same

time. In the same way it’s possible to use alternatives A and C, I2C and OUT1 at the same

time.

Figure 5. CO2 Engine™ ICB Possible connection terminals for connection by long wires and UART at

the same time.

Din3

UART_TxD

UART_RxD

DVCC = 3.3V

G0

G+

G0

Din2

G0

Din0

Din1

G0

OU

T2 (

An

alo

gu

e o

utp

ut)

O

UT

1 (

Op

en

co

llecto

r)

GN

0

G+


Diffusion or tube IN/OUT alternatives

CO2 Engine™ ICB can be supplied in diffusion modification with or without O-ring.

Figure 6. CO2 Engine™ ICB diffusion model.

CO2 Engine™ ICB can be supplied in tube in/out modification with different orientation of

tube attachment head in steps of 120 degrees.

Figure 7. CO2 Engine™ ICB tube IN/OUT model.


Figure 8a . CO2Engine™ ICB Test/sample gas ports.

Figure 8b . CO2Engine™ ICB Possible test/sample gas ports installations.

test/sample

gas output port

test/sample

gas input port


Terminal description

The table below specifies terminals and I/O options available in the general K33 platform (see

also the alternative connection pictures above).

Functional group

Descriptions and ratings

Power supply (all connection alternatives)

G+ referred to G0

Power supply plus terminal Protected by series 3.3R resistor and zener diode

Absolute maximum ratings 5 to 14V, stabilized to within 10%

G0 Power supply minus terminal Sensor’s reference (ground) terminal

DVCC = 3.3V Output from sensor’s digital voltage regulator. Series resistance 10 R Available current 12mA Voltage tolerance (unloaded) +-3% max (+-0.75% typ) Output may be used to power circuit (microcontroller) in host system or to

power logical level converter if master processor runs at 5V supply voltage.

Communication

UART

(UART_TxD,

UART_RxD)

CMOS physical layer, ModBus communication protocol. (refer “ModBus on CO2 Engine K30 rev1_07.pdf” or later version for

details)

UART_RxD line is configured as digital input. Input high level is 2.1V min Input low level is 0.8V max UART_TxD line is configured as digital output. Output high level is 2.3V (assuming 3.3V DVCC) min. Output low level is 0.75V max UART_RxD input is pulled up to DVCC = 3.3V by 56 kOhm UART_TxD output is pulled up to DVCC = 3.3V by 56 kOhm ABSOLUTE MAX RATING G0-0.5V ….. DVCC + 0.5V

I2C extension.

(I2C_SCL,

I2C_SDA)

Pull-up to DVCC = 3.3V. (refer “I2C comm guide rev2_00 DRAFT.pdf” or later version for details)

ABSOLUTE MAX RATING G0-0.5V ….. DVCC + 0.5V

Outputs

OUT1, OC

(Open collector) Digital output, Open collector Series resistance 120 R Max sink current 40mA

May be configured as

1. Alarm indication output

2. PWM output, 10 (alt. 12 to 16) bit resolution. Period 1 .. 1000 msec

3. Pulse length proportional to measured CO2 value.

OUT2 Analog output 0..5V


Buffered linear output 0..4 or 1..4VDC or 0..5V or 1..5V, depending on

specified power supply and sensor configuration. ROUT

< 100 Ω, RLOAD

> 5 kΩ

Load to ground only! Resolution 5mV

RELAY

(RelayPoleNC

RelayPoleCom

RelayPoleNO)

RELAY

It’s not a standard option.

Maximum switching capability 1A/50VAC/24VDC

Digital I/Os, used as Inputs in standard configuration. May be implemented as jumper field

Din0

Din1

Din2

Digital switch inputs in standard configuration, Pull-up 56k to DVCC 3.3V. Driving it Low or connecting to G0 activates input. Pull-up resistance is decreased to 4..10k during read of input or jumper. Advantages are lower consumption most of the time the input/jumper is kept low and larger current for jumpers read in order to provide cleaning of the contact.

Can be used for zero or background calibration forcing.

Din3

R/T control line for UART connection to RS485 driver.

Table I. I/O notations used in this document for the K33 platform with some descriptions and ratings.

Please, beware of the red colored texts that pinpoint important features for the system integration!


Mechanical drawings

Figure 9 . CO2Engine™ ICB mechanical drawing. Hole/contacts positions.


Figure 10a . CO2Engine™ ICB OBA position. Tube IN/OUT model

Figure 10b . CO2Engine™ ICB OBA position. Diffusion model..

PRELIMINARY


Fig

ure

11 . CO

2Engine™

ICB

mec

han

ical

dra

win

g.

Tube I

N/O

UT

mo

del

PRELIMINARY


Fig

ure

12 . CO

2Engine™

ICB

mech

an

ical

dra

win

g.

Dif

fusi

on m

od

el.


Ground / Shield attachments

Both Analog ground (AGND) and digital ground (DGND) are connected internally to the G0

terminal of the sensor. AGND is connected to the most sensitive analogue part of the sensor

and DGND is connected to the digital part of the sensor.

Do NOT connect AGND and DGND together externally to sensor!

Figure 13 . CO2Engine™ ICB ground / shield attachment

Maintenance When used in environments where the built-in self-correcting ABC algorithm can be enabled

the CO2Engine™ ICB is basically maintenance free. Since the ABC algorithm can not be

used in all applications it is disabled in sensors default appearance.

Discuss your application with SenseAir in order to get advice for a proper calibration strategy.

When checking the sensor accuracy, PLEASE NOTE that the sensor accuracy is defined at

continuous operation with enabled ABC algorithm (at least 3 weeks after installation) or after

zero/background calibration.

Calibration

When enabled the ABC algorithm (Automatic Baseline Correction) constantly keeps track of

the sensor’s lowest reading over a 7,5 days interval and slowly corrects for any long-term drift

detected as compared to the expected fresh air value of 0.04%vol CO2.

DGND

Digital ground

AGND

Analogue ground


Rough handling and transportation might result in a reduction of sensor reading accuracy. If

the ABC algorithm is enabled it will tune the readings back to the correct numbers. The

default “tuning speed” is however limited. This limit is application specific. In case that the

ABC function is disabled (default appearance) or one cannot wait for the ABC algorithm to

cure any calibration offset, two switch inputs Din1 and Din2 are defined for the operator to

select one out of two prepared calibration codes. If Din1 is shorted to ground, for a minimum

time of 8 seconds, the internal calibration code bCAL (background calibration) is executed,

in which case it is assumed that the sensor is operating in a fresh air environment (400 ppm

CO2). If Din2 is shorted instead, for a minimum time of 8 seconds, the alternative operation

code CAL (zero calibration) is executed in which case the sensor must be purged by some

gas mixture free from CO2 (i.e. Nitrogen or Soda Lime CO2 scrubbed air). If unsuccessful,

please wait at least 10 seconds before repeating the procedure again. Make sure that the

sensor environment is steady and calm!

Input

Switch Terminal (normally open)

Default function

(when closed for minimum 8 seconds)

Din1

bCAL (background calibration) assuming 400 ppm CO2 sensor exposure

Din2

CAL (zero calibration) assuming 0 ppm CO2 sensor exposure

Table II. Switch input default configurations for CO2Engine™ ICB

Figure 14. CO2 Engine™ ICB calibration jumpers.

G0

Din2

Din1

G0

CAL

bCAL


CO2Engine™ ICB - Technical specification (continuous operation)

General Performance: Storage Temperature Range ................ -40 to +70 °C Sensor Life Expectancy ....................... > 15 years Maintenance Interval ............................ subject for discussion with customer. Maintenance-free if ABC (Auto Baseline

Correction) algorithm is applicable. See discussion of ABC algorithm on page 14. Self-Diagnostics ................................... complete function check of the sensor module Warm-up Time ..................................... ≤ 1 min

Conformance with the standards ........... EN 61326-1 (2006), Class B emission, Table 2 Industrial location immunity RoHS directive 2002/95/EG

Operating Temperature Range ............ 0 to 50 °C Operating Humidity Range ................... 0 to 95% RH (non-condensing) Operating Environment ........................ Residential, commercial, industrial spaces and potentially dusty air ducts used in

HVAC (Heating Ventilation and Air-Conditioning) systems.2

Electrical / Mechanical: Power Input........................................... 5-14 VDC max rating, stabilized to within 10% (on board protection circuits)

3

Current Consumption ............................ 40 mA average < 200 mA average during IR lamp ON (120 msec) < 250 mA peak power (during IR lamp start-up, the first 50 msec)

Electrical Connections4

........................ terminals not mounted (G+, G0, OUT1, OUT2, Din1, Din2, TxD, RxD) Dimensions ........................................ 5.1 x 5.7 x 1.4 cm (Length x Width x approximate Height)

CO2 Measurement: 4

Sensing Method .................................... non-dispersive infrared (NDIR) waveguide technology with ABC

automatic background calibration algorithm Sampling Method .................................. diffusion or flow, subject for discussion with customer

Response Time (T1/e

) ........................... <20s, diffusion or tube IN/OUT (0.2l/minute gas flow)

Measurement Range ............................ 0 to 30%vol.

Digital resolution ................................... 0.001% vol

Repeatability ......................................... ± 0.1 %vol. CO2 ± 2 % of measured value

Accuracy 1, 5

......................................... ± 0.5 %vol. CO2 ± 3 % of measured value Pressure Dependence .......................... + 1.6 % reading per kPa deviation from normal pressure, 100 kPa On-board calibration support ................. Din1 switch input to trigger Background Calibration @ 400 ppm (0.04%vol) CO2

Din2 switch input to trigger Zero Calibration @ 0 ppm CO2

Linear Signal Output: 4,6

OUT2 D/A Resolution ......................... 5 mV Linear Conversion Range ........ 0 - 5 VDC for 0 – 20%vol.

Electrical Characteristics .......... ROUT

< 100 Ω, RLOAD

> 5 kΩ , Power input > 5,5 V 6

Note 1: In normal IAQ applications. Accuracy is defined after minimum 3 weeks of continuous operation. However, some industrial

applications do require maintenance. Please, contact SenseAir for further information!

Note 2: SO2 enriched environments are excluded.

Note 3: Notice that absolute maximum rating is 14V, so that sensor can be used with 12V+-10% supply.

Note 4: Different options exist and can be customized depending on the application. Please, find possible options in this document and

contact SenseAir for further information!

Note 5: Accuracy is specified over operating temperature range. Specification is referenced to certified calibration mixtures. Uncertainty of

calibration gas mixtures (+-2% currently) is to be added to the specified accuracy for absolute measurements.

Note 6: For the buffered output OUT2 the maximum output voltage range equals power voltage input minus 0,5 V


PWM Output:

Electrical Characteristics ................ Open collector with series 120R resistor, 10kΩ pull-up resistor to protected power (+) Minimum output concentration ....... 0%

vol

Output cycle period ........................ 1004ms Output high level min duration ........ 2.0ms (@ 0%

vol)

Output high level max duration ....... 1002ms (@ 20%vol.

)

Resolution .............................. 0.5ms (@0.01%vol

= 100 ppm)

Sensor PWM output timing diagram

2.0ms

1004ms

0 % vol:

2.0ms

2.5ms

0.01 %vol:

2.5ms

1004ms

3.0ms

0.02 %vol:

3.0ms

1004ms

1002ms

20.00%vol

2.0ms

1004ms

1001.5ms

19.99%vol

2.5ms

1004ms

1001ms

19.98%vol

3.0ms

1004ms

Figure 15. CO2 Engine™ ICB OUT1 timing diagram.


Materials

Component / coating

Material Notes

PCB

FR4,

Base laminate – copper clad glass

base epoxy resin in accordance

with IPC-4101/124

Surface finish of

unsoldered copper on

PCB

Gold plated, ENIG,

thickness 0.05 um min

Solder mask

Liquid photo-image able

OBA

LCP700 TBD, it is plastic from LCP

family. It’s chemically inert

plastic stable in most chemicals.

OBA coating

OBA is not coated Absence of coating provides

extra resistance of OBA against

corrosive environments

Gases that may affect sensor’s operation

Since optical part has no reflective coating, stability of the sensor is governed by corrosion

resistance of electronic assembly.

Corrosive environments containing but not limited by hydrogen sulfide, ammonia, ozone,

sulphuric acid, sulfur dioxide should be avoided.


Use ideas (connections)

Alternative E.

CO2 Engine™ ICB is a stand-alone module connected to the host system by 3-wire interface

(JP13 may be chosen to be 3 pole connector) with power supply and open collector output for

alarm condition indication. Open collector output may drive LED or relay or buzzer in the

case of alarm conditions.

Open collector may provide PWM signal with duty cycle representing CO2 concentration

No

t U

sed

OU

T1,

OC

G0

G+


Alternative F. CO2 Engine™ ICB is a stand-alone module connected to the host system by 3-wire interface

(JP8 may be chosen to be 3 pole terminal) with power supply and open collector output for

alarm condition indication. Open collector output may drive LED or relay or buzzer in the

case of alarm conditions.


Alternative E. CO2 Engine™ ICB is a stand-alone module with open collector output and NC/NO relay


Rela

yP

ole

NC

R

ela

yP

ole

Co

m

Rela

yP

ole

NO

O

UT

1 O

pen

Co

llecto

r G

0

G+

OU

T2 (

An

alo

gu

e o

utp

ut)

OU

T1 (

Op

en

co

llecto

r)

GN

0

G+


WARRANTY and Limitation of Liability

1. SenseAir warrants that for a period of twenty four (24) months following receipt by Buyer

the Product supplied by SenseAir to Buyer will be, under normal use and care, free from

defects in workmanship or material and to be in material conformity with SenseAir's

specifications. Units returned to SenseAir for warranty repairs shall be shipped to SenseAir, at

Buyer’s expense, according to SenseAir's instruction. Within ninety (90) days of the receipt of

product, SenseAir shall replace or repair such units and shall ship them to Buyer’s designated

return destination freight pre paid.

2. Warranty Limitations. This warranty does not extend to any unit that has been

subject to misuse, neglect or accident; that has been damaged by causes external to the

unit; that has been used in violation of SenseAir's instructions; that has been affixed to any

non-standard Accessory attachment; or that has been modified, disassembled, or reassembled

by anyone other than SenseAir.

3. The retailer is not responsible for any consequential loss or damages, which may occur by

reason of purchase and use of this product. The warranty is, in any event, strictly limited to

the replacement/repair of the product

Address:SenseAir AB, Box 96, SE-820 60 Delsbo, Sweden Phone: +46-(0)653-71 77 70 · Fax: +46-(0)653-71 77 89

E-mail: [email protected] · Home page: www.senseair.com


Revision history Edition Date By Description

PA1 2008-05-01 PZ First appearance

PA2 2008-07-21 IU Correcting pictures

PA3 2008-07-27 IU Correcting pictures

PA4 2008-08-07 PZ Update with new pictures and PWM output.

PA5 2008-08-08 PZ Added materials chapter.

PA6 2008-08-08 PZ Convert CNT spec into ICB spec with corrections by HM

PA8 2009-11-02 JA Correcting pictures

1.00 2011-07-04 LN Correcting linear conversion range

1.01 2012-05-30 LN CO2 measurement accuracy updated

em co2-engine-icb description rev 1.01 · pdf fileem_co2-engine-icb_description_rev_1.01.doc...

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